feat: fix skill transformation pipeline across all targets (#334)

src/utils/codex-content.ts

@@ -29,14 +29,16 @@ export function transformContentForCodex(
   const skillTargets = targets?.skillTargets ?? {}
   const unknownSlashBehavior = options.unknownSlashBehavior ?? "prompt"
 
-  const taskPattern = /^(\s*-?\s*)Task\s+([a-z][a-z0-9:-]*)\(([^)]+)\)/gm
+  const taskPattern = /^(\s*-?\s*)Task\s+([a-z][a-z0-9:-]*)\(([^)]*)\)/gm
   result = result.replace(taskPattern, (_match, prefix: string, agentName: string, args: string) => {
     // For namespaced calls like "compound-engineering:research:repo-research-analyst",
     // use only the final segment as the skill name.
     const finalSegment = agentName.includes(":") ? agentName.split(":").pop()! : agentName
     const skillName = normalizeCodexName(finalSegment)
     const trimmedArgs = args.trim()
-    return `${prefix}Use the $${skillName} skill to: ${trimmedArgs}`
+    return trimmedArgs
+      ? `${prefix}Use the $${skillName} skill to: ${trimmedArgs}`
+      : `${prefix}Use the $${skillName} skill`
   })
 
   const slashCommandPattern = /(?<![:\w])\/([a-z][a-z0-9_:-]*?)(?=[\s,."')\]}`]|$)/gi

src/utils/files.ts

@@ -104,3 +104,34 @@ export async function copyDir(sourceDir: string, targetDir: string): Promise<voi
     }
   }
 }
+
+/**
+ * Copy a skill directory, optionally transforming SKILL.md content.
+ * All other files are copied verbatim. Used by target writers to apply
+ * platform-specific content transforms to pass-through skills.
+ */
+export async function copySkillDir(
+  sourceDir: string,
+  targetDir: string,
+  transformSkillContent?: (content: string) => string,
+): Promise<void> {
+  await ensureDir(targetDir)
+  const entries = await fs.readdir(sourceDir, { withFileTypes: true })
+
+  for (const entry of entries) {
+    const sourcePath = path.join(sourceDir, entry.name)
+    const targetPath = path.join(targetDir, entry.name)
+
+    if (entry.isDirectory()) {
+      await copySkillDir(sourcePath, targetPath, transformSkillContent)
+    } else if (entry.isFile()) {
+      if (entry.name === "SKILL.md" && transformSkillContent) {
+        const content = await readText(sourcePath)
+        await writeText(targetPath, transformSkillContent(content))
+      } else {
+        await ensureDir(path.dirname(targetPath))
+        await fs.copyFile(sourcePath, targetPath)
+      }
+    }
+  }
+}